It happaned to me, syslog is:

Jun  3 12:43:59 sem-ubuntu kernel: [11533.832201] NVRM: GPU at 0000:01:00: 
GPU-40659ece-dd29-caba-4a28-a732e7617170
Jun  3 12:43:59 sem-ubuntu kernel: [11533.832206] NVRM: Xid (0000:01:00): 13, 
0001 00000000 00008597 000015e0 00000000 00000100
Jun  3 12:43:59 sem-ubuntu kernel: [11534.095887] NVRM: Xid (0000:01:00): 13, 
0001 00000000 00008597 000015e0 00000000 00000100
Jun  3 12:44:00 sem-ubuntu kernel: [11534.378072] NVRM: Xid (0000:01:00): 13, 
0001 00000000 00008597 000015e0 00000000 00000100
Jun  3 12:44:00 sem-ubuntu kernel: [11534.645757] NVRM: Xid (0000:01:00): 13, 
0001 00000000 00008597 000015e0 00000000 00000100
Jun  3 12:44:00 sem-ubuntu kernel: [11534.925497] NVRM: Xid (0000:01:00): 13, 
0001 00000000 00008597 000015e0 00000000 00000100
Jun  3 12:44:37 sem-ubuntu kernel: [11571.881179] NVRM: Xid (0000:01:00): 3, C 
00000001 SC 00000003 M 00000104 Data 00000000
Jun  3 12:44:41 sem-ubuntu kernel: [11575.895227] NVRM: Xid (0000:01:00): 13, 
0002 00000000 0000502d 00000220 ffffffff 0000000c
Jun  3 12:44:41 sem-ubuntu kernel: [11575.914721] NVRM: Xid (0000:01:00): 13, 
0002 00000000 0000502d 00000250 ffffffff 0000000c
Jun  3 12:45:30 sem-ubuntu gnome-session[1943]: Gdk-WARNING: gnome-session: 
Fatal IO error 11 (资源暂时不可用) on X server :0.#012
Jun  3 12:45:31 sem-ubuntu pulseaudio[5136]: [pulseaudio] client-conf-x11.c: 
xcb_connection_has_error() 已返回 true
Jun  3 12:45:31 sem-ubuntu pulseaudio[5149]: [pulseaudio] pid.c: Stale PID 
file, overwriting.
Jun  3 12:45:31 sem-ubuntu pulseaudio[5149]: [pulseaudio] bluetooth-util.c: 
Error from ListAdapters reply: org.freedesktop.DBus.Error.AccessDenied
Jun  3 12:45:31 sem-ubuntu pulseaudio[5149]: [pulseaudio] server-lookup.c: 
Unable to contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect 
to socket /tmp/dbus-JMiwIZqPrz: 拒绝连接
Jun  3 12:45:31 sem-ubuntu pulseaudio[5149]: [pulseaudio] main.c: Unable to 
contact D-Bus: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket 
/tmp/dbus-JMiwIZqPrz: 拒绝连接
Jun  3 12:45:31 sem-ubuntu acpid: client 1261[0:0] has disconnected
Jun  3 12:45:31 sem-ubuntu acpid: client 1261[0:0] has disconnected
Jun  3 12:45:31 sem-ubuntu acpid: client connected from 5152[0:0]
Jun  3 12:45:31 sem-ubuntu acpid: 1 client rule loaded
Jun  3 12:45:34 sem-ubuntu kernel: [11628.747895] NET: Unregistered protocol 
family 39

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https://bugs.launchpad.net/bugs/999191

Title:
  10de:0421 X crashes with gnome-session: Fatal IO error 11

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